1. Create a server
To choose a suitable cloud server platform, buy one of their own server
2. Download python
Query system installed python version
ls -l /usr/bin/python*
apt-get python3
3. The python3 as the default python
Method 1:
# 系统中python默认版本为python2.7，可以将其修改为python3
# 第一步：先删除python
rm -rf /usr/bin/python
# 第二步：创建软链接
ln -s /usr/bin/python3 /usr/bin/python
# 第三步：查看python版本是否修改为python3
python -V
法2：
https://blog.csdn.net/langb2014/article/details/78919562/
Using the update-alternatives switch channels
1. First check whether there are options on the python
$ update-alternatives --display python
一般为无
2. Establish python groups, and add Python3 of options (the default is python2)
$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.7 1（这里后面的1是优先级）
At this point you query the python version or 2, because the default settings are not modified
$ sudo update-alternatives --config python
输入这行代码之后，他会让你选择号码，你就按1就好，因为刚刚创建的优先级就是1
4.pip mismatch:
When you use the pip, the method appears mismatch can use the following
sudo apt-get remove python-pip
wget https://bootstrap.pypa.io/get-pip.py
python get-pip.py
hash -r
Download python 5.1 of Creation Environment
https://blog.csdn.net/langb2014/article/details/78919562/ Ibid.
$ sudo pip install virtualenvwrapper
$ mkvirtualenv -p python3 （环境名）
5.2.解决mkvirtualenv: command not found
https://blog.csdn.net/Ayue1220/article/details/91359119
cd ~/
vim .bashrc
# 在最后面加上下面代码
export WORKON_HOME=~/.environments
source /usr/local/bin/virtualenvwrapper.sh
# 按: wq退出
重启一下
source ~/.bashrc
6. solve pip change the source list and Error
https://blog.csdn.net/wls666/article/details/95456309
cd ~
mkdir .pip
vim pip.conf
出入一下代码
[list]
format=columns
[global]
timeout = 6000
index-url = http://pypi.douban.com/simple
trusted-host = pypi.douban.com
# 源可以自行选择
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